Modeling the non-linear deformation of a short-flax-fiber-reinforced polymer composite by orientation averaging

Modniks, Jānis; Andersons, J.

doi:10.1016/j.compositesb.2013.04.058

Cited by 50 publications

(27 citation statements)

References 21 publications

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“…plasticity creating more complications from a microstructural point of view, in which researchers have applied orientation averaging in unit cells to model this behavior 10 .…”

mentioning

confidence: 99%

Predicting Microstructural Void Nucleation in Discontinuous Fiber Composites through Coupled in-situ X-ray Tomography Experiments and Simulations

Hanhan

Agyei

Xiao

et al. 2020

Sci Rep

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composite materials have become widely used in engineering applications, in order to reduce the overall weight of structures while retaining their required strength. in this work, a composite material consisting of discontinuous glass fibers in a polypropylene matrix is studied at the microstructural level through coupled experiments and simulations, in order to uncover the mechanisms that cause damage to initiate in the microstructure under macroscopic tension. Specifically, we show how hydrostatic stresses in the matrix can be used as a metric to explain and predict the exact location of microvoid nucleation that occurs during damage initiation within the composite's microstructure. furthermore, this work provides evidence that hydrostatic stresses in the matrix can lead to coupled microvoid nucleation and early fiber breakage, and that small fragments of fibers can play an important role in the process of microvoid nucleation. These results significantly improve our understanding of the mechanics that drive the initiation of damage in the complex microstructures of discontinuous fiber reinforced thermoplastics, while also allowing scientists and engineers to predict the microstructural damage behavior of these composites at sub-fiber resolution and with high accuracy. Composite materials have gained attention in many engineering applications, especially in the aerospace and automotive industries due to their low weight and high strength. Specifically, polymer matrix composites have allowed for major weight savings and higher performance aircraft and vehicles. Despite their high rate of implementation, scientists and engineers have faced challenges in predicting their mechanical behavior and performance, especially past the small strain regime and into the damage initiation and damage propagation regimes, because there exist a number of damage mechanisms which are often coupled and are active throughout the life of a component. Compared to continuous fiber composites, discontinuous fiber reinforced polymers exhibit vastly heterogeneous microstructures that can vary significantly depending on the component geometry, making mechanical behavior predictions even more complicated 1-3. Until recently, most efforts in predicting the mechanical performance of discontinuous fiber composites have been focused on the elastic loading regime during which damage has not yet initiated and progressed 4,5. Efforts in understanding and predicting the behavior of fiber composites past the elastic regime have typically focused on attempting to replicate the macroscopic bulk stress-strain behavior of a specimen through phenomenological damage parameters 6. In recent years, some microstructural approaches have been used to explore the damage mechanisms in certain composites using homogenization approaches 7 as well as unit cell methods 8. Experimentally, one in-situ study of a thermoset polymer, reinforced with discontinuous carbon fibers, showed that fiber tips play an important role in microvoid nucleation due to high shear stress...

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“…plasticity creating more complications from a microstructural point of view, in which researchers have applied orientation averaging in unit cells to model this behavior 10 .…”

mentioning

confidence: 99%

Predicting Microstructural Void Nucleation in Discontinuous Fiber Composites through Coupled in-situ X-ray Tomography Experiments and Simulations

Hanhan

Agyei

Xiao

et al. 2020

Sci Rep

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“…24 In this method, for composites with misaligned fibers, under a given strain (ε), the average stress (σ ave ) can be obtained using the following expression. 24 σ ave ε ð Þ =…”

Section: Orientation Average Methodsmentioning

confidence: 99%

Meso research on the fiber orientation distribution of aramid fiber‐reinforced rubber composite

Gao

Jiao

Zhang

et al. 2020

Polymers for Advanced Techs

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Aramid fiber-reinforced rubber composites (AFRCs) have attracted considerable attention due to their excellent mechanical properties. These mechanical properties provide the composites with a certain degree of anisotropy due to the fiber orientation distribution (FOD) in the AFRCs, thereby allowing them to flexibly meet requirements based on different scenarios. However, the quantitative determination of FOD in AFRCs continues to be a challenge. In this study, the triple ion-beam cutting technique was proposed to obtain high-quality polished cross-sections of the AFRCs. An image processing technique was used to separate the rubber matrix and the fiber in the optical micrograph. The fiber orientation information was extracted based on the shape of the fiber section. The FODs of the AFRCs were described using the probability function. Finally, the mechanical property was evaluated using a 2D finite element analysis. The agreement between the experimental and numerical results validated the effectiveness of the proposed method.

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“…9 shows the impact of fiber misalignment on the predicted strength of the composite loaded in axial tension, as dictate by the maximum von Mises stress, r ðbcÞ eq , see Eq. (28), in the matrix constituent material. That is, this 'strength' corresponds to the global uniaxial tensile stress for damage initiation in the matrix, predicted based on the maximum local von Mises stress throughout the matrix.…”

Section: It Is Of Interest To Examine the Variation Of Various Compositementioning

confidence: 99%

“…Li et al [21] have recently applied the microsphere approach to structural composite materials, wherein a von Mises fiber orientation distribution has been employed. Orientational averaging was also recently employed by Modniks and Andersons [28] to model the nonlinear mechanical response of short-flax-fiber-reinforced composites using an analytical approach. While the approach and equations were general in terms of fiber misalignment distribution, results focused on a uniform distribution.…”

Section: Introductionmentioning

confidence: 99%

The effect of general statistical fiber misalignment on predicted damage initiation in composites

Bednarcyk

Aboudi

Arnold

2014

Composites Part B: Engineering

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a b s t r a c tA micromechanical method is employed for the prediction of unidirectional composites in which the fiber orientation can possess various statistical misalignment distributions. The method relies on the probability-weighted averaging of the appropriate concentration tensors, which are established by the micromechanical procedure. This approach provides access to the local field quantities throughout the constituents, from which initiation of damage in the composite can be predicted. In contrast, a typical macromechanical procedure can determine the effective composite elastic properties in the presence of statistical fiber misalignment, but cannot provide the local fields. Fully random fiber distribution is presented as a special case using the proposed micromechanical method. Results are given that illustrate the effects of various amounts of fiber misalignment in terms of the standard deviations of in-plane and out-of-plane misalignment angles, where normal distributions have been employed. Damage initiation envelopes, local fields, effective moduli, and strengths are predicted for polymer and ceramic matrix composites with given normal distributions of misalignment angles, as well as fully random fiber orientation.Published by Elsevier Ltd.

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Modeling the non-linear deformation of a short-flax-fiber-reinforced polymer composite by orientation averaging

Cited by 50 publications

References 21 publications

Predicting Microstructural Void Nucleation in Discontinuous Fiber Composites through Coupled in-situ X-ray Tomography Experiments and Simulations

Predicting Microstructural Void Nucleation in Discontinuous Fiber Composites through Coupled in-situ X-ray Tomography Experiments and Simulations

Meso research on the fiber orientation distribution of aramid fiber‐reinforced rubber composite

The effect of general statistical fiber misalignment on predicted damage initiation in composites

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